Effect of Channel Adjustment Processes on Reliability of Bridge Foundations

Abstract

Alluvial channels readily adjust their morphology, hydraulics, and sedimentology in response to disturbances. Knowledge of the spatial and temporal trends of channel adjustment is central to the protection and maintenance of bridges. In this study the reliability of a bridge during the process of erosive channel adjustments following channel modifications is quantified. An interdisciplinary approach is used to determine the stage of channel evolution following the disturbance and the dominant processes during each stage, and to compute the probability of bridge failure or reliability. An actual case study in west Tennessee is provided. Information from this technical note can be used to determine the effect of channel modifications on highway structures and the vulnerability of bridges to erosional processes over the life of the bridge, and to assess maintenance and mitigation needs.